One-piece reinforced carton



April 22, 1952 R. GUYER ONE-PIECE REINFORCED CARTON 5 Sheets-Sheet 1 Filed July 12, 1946 April 22, 1952 GUYER 2,594,156

ONE-PIECE REINFORCED CARTON Filed July 12, 1946 3 Sheets-Sheet 2 65 64 i5 17 19 16 15 14 13 1g 11 L j l f l April 22, 1952 R. GUYER ONE-PIECE REINFORCED CARTON 3 Sheets-Sheet 5 Filed July 12 1 compressible even in a solid state.

Patented Apr. 22, 1952 UNITED STATES PATENT OFFICE.

ONE-PIECE REINFORCED CARTON Reynolds Guyer, St. Paul, Minn., assignor to Waldorf Paper Products Company, St. Paul, Minn., a corporation of Minnesota Application July 12, 1946, Serial No. 683,111

2 Claims.

My invention relates to an improvement in one piece reinforced carton wherein it is desired to provide a carton possessing high stacking strength from a single sheet of carton stock.

Many cartons are at present being used for the packaging of materials such as cheese which is relatively heavy and yet which is somewhat After such cartons have been filled they are usually stacked on a movable platform and maintained on this platform until they are shipped. It has often been necessary to provide shelves or self-supporting trays on these platforms in order to prevent compression of the lower packages of the stack. The use of such shelves or trays requires considerable time for the operation which might be avoided if the packages possessed suflicient stacking strength to resist compression. As such packages often include two pounds of cheese, for example, there is considerable weight on the lowermost packages of the stack and the cartons must be extremely rigid to withstand this weight.

A feature of the present invention resides in the provision of a carton having side and end walls which are comprised of at least three thicknesses of carton stock. As a result relatively light paper board may be used in the formation of the cartons and a minimum of paper stock is required. The triple thickness side and end walls provide the necessary stacking strength while the top and bottom surfaces of the package are of single thickness stock. As a result a lesser amount of paper board is employed than would be necessary if the entire carton were formed of paper board sufiiciently thick to with stand equal pressure.

A feature of the present invention resides in the provision of a carton having side walls of triple thickness stock, the three laminations being adhered together. I have found that the carton wall formed of three adhered laminations is usually stronger and will withstand more pressure than a single sheet of equal thickness.

A further feature of the present invention lies in the provision of a carton which can be formed on gluing apparatus in common use. My carton is so constructed that the folding operations can be conveniently accomplished on a gluer of the type usually found in carton manufacturing plants.

A further feature of the present invention resides in the provision of a carton which can be easily opened up to remove all of the contents in a body. Such a structure is of decided advantage for use with certain products such as cheese wherein it is desired to remove the entire loaf of cheese bodily from the carton so that it may be sliced or cut.

A feature of the present invention resides in the provision of a one piece carton in which two of the sides may be opened up so that the product contained is easily accessible. When my carton is opened two adjacent sides of the carton may be folded open, revealing two sides of the brick of cheese or other material contained therein, thereby rendering the material readily accessible.

A further feature of the present invention resides in the provision of a carton which is of the reclosing type. My carton may be opened up and part of the contents removed. The con'-, tents can than be replaced in the carton and the carton closed to protect the remainder of the contents.

A further feature of the present invention lies in the provision of a carton of the tubular, type which can be shipped in fiat condition and conveniently stored. At the same time my carton may be sealed in the manner common. to such tubular cartons without the provision of special sealing equipment.

An'added feature of the present invention resides in the fact that the contents may be conveniently inserted in a transparent envelope or Wrapper placed within the carton and formed so that the seam of the bag or Wrapper is not exposed when the package is open. In the packaging of cheese for example, printed transparent wrappers are usually provided which have at' least one longitudinal seam extending the length thereof. This bag may be conveniently'inserted in the package so that the seam is on the bottom of the loaf when the carton is opened so that the goods contained are effectively displayed.

An added feature of the present invention resides in the provision of a tubular carton which may be filled and sealed on usual apparatus ems ployed for such cartons and yet which may open up along a longitudinal edge of the carton to display the entire contents.

These and other objects and novel feature of my invention will be more clearly and fully set forth in the following specification and claims. g In the drawings forming a part of my specifie cation:

Figure 1 is a diagrammatic view showing a carton blank embodying my new construction.

wall of the carton being broken away to show the construction thereof.

Figure shows the end flaps of the carton in partially folded position. This view is diagrammatic to show the order inwhich the flaps are sealed as under usual practice one end would be entirely sealed before theother end was sealed.

Figure 6 is a perspective view of the sealed carton showing diagrammatically the manner in which the carton may be opened.

Figure 7 is a perspective view of the carton in open position. L

Figure 8 is a transverse section through the sealed carton; showing the arrangement of. the sidewallsthereof.

The. carton1A is formed from. the; blank best illustrated in Figure 1 of the drawings. The

blank Aincludes a reinforcing panel H] hingedly connected by the score line H to the outer side walLpaneli l2. The panel I2 is foldably connected: along the fold line l3 to the top panel M The top panel i4 is foldably connected along, the fold line' I5 to theouter side wall panel- ].6'. This outer side wallpanel is con nected; by a fold line H to the intermediate side wall reinforcing panel 9. The panel is is connected along the: score line 29 to the inner sidewall. reinforcing panel 21. This panel 24 is connected along the fold line 22 to the bottom panel 23. 'Ihebottom panel 23 isfoldably connected. along the scoreline 24 to the inner sidewall, reinforcing panel 25. In the construction'illustrated the various fold lines II, It; 4:5; IL 22, and 24 are substantially parallel.

At -certain of the; fold lines where the stock i'sgdoubled back: upon itself it may be desirable to. provide a cut score or a perforated line, particularly where the fold: line is not visible on the exterior of the package; For example the paper stock is folded through 180" along the fold line 20- on the interior of the carton and this. fold, line is preferably perforated or formed as a cut scoreto simplifythe folding operation.

The blank shown in. Figure 1 of, the drawings is... folded. intothe condition illustrated in Fig:- ure- 2 of the drawings.v To accomplish this result the. stock isfolded along the score or perforated line 2!! sothat the panel i9- overlies the-panel 2i. Adhesive 25. is appliedbetween the; panels: l9 and. 2i to adhere these two panels together. In the. construction shown the adhesive 28 is, shown in. two spaced strips extending lengthwise. of the panels, but actually this adhesive may extend the whole width of" the panels l9; and 2| if desired. Both of the panels 19* and 2| are folded beneath the panel 1-6, the folding taking place along the fold line ll. Adhesi ve 27, either in. separate strips or in a wide band}. is applied between the panels it and ill to adhere these panel's. securely together; The

order in which the panels: are folded and glued may be reversed if desired; the panel is being foldedibeneath the panel i5. and adhered thereto prior to the time the panel 2 I is folded against and adhered to. the. panel 1-9. Alternatively the two folding operations may take place simul taneously.

Thei foregoing folding operations provide a in Figures 4 and 8 of the drawings.

triple thickness wall which will eventually form one side wall of the carton. The triple thickness wall is composed of the panels l6, l9, and 2| which appear in surface contacting relation at the'left hand side of Figure 8. In this figure the panels are shown slightly spaced in order to indicate the adhesive therebetween. Actually, however, when adhered these panels will be in surface contacting relationship.

The panel I!) is likewise folded along the fold line I! to underlie the panel [2. Adhesive 29 is applied between the panels In and [2 to adhere these two panels closely together. The adhesive 29 is shown in two spaced strips, but obviously the entire surface of these flaps may be adhered together if deemed advisable.

The blank when thus folded appears as illustrated in Figure 2 of the drawings and the manner in which the folding appears is also visible in Figure 3. The carton. is now ready to be adhered in tubular relationship as indicated, in Figure 4 of the drawings.

The carton is next folded, either along, the

fold line 22 or the fold line 24 and the combined panels l0 and'lZ are folded into surface contacting relationship therewith. If the panel 25 is folded along the-fold line 22 the combined panels l8 and I2 are folded about the fold line 13 to overlie the panel is to overlie the panel 25. Similarly if the first folding operation takes place along the fold line 24, the panels 19 and I2 together with the panel M are folded along the fold line IE to overlie the panel '25. Adhesive 3!} is applied between the panels in and 25 to adhere these panels together.

As indicated in Figure 1 of the drawings. I prefer to print a portion of the surface of the panels Ill and 25 with ink capable of repelling the adhesive employed. This printing is arranged to leave a rectangular relatively narrow strip of unprinted stock indicated by the broken line 31 enclosed within alarger rinted area indicated by the broken line 32. Similarly the panel I 0 includes a printed area bounded by the broken line .33 leaving a corresponding unprinted strip bounded by the broken line 34 near the fold line H. The surfaces 3! and 34 correspond in folded condition of the blank so that glue applied either to the surface 3| or to the surface 34' will cause. adherence between the surfaces 3| and 34.. This procedure is followed in order to limit the tearing of theliner of the carton stock as the carton is opened; thus preventing strips or ribbons of carton stock liner from adhering to the panels it and 25 after the cartonhas' been opened.

When the carton has been adhered as described, the carton is of tubular form illustrated Each, of two opposed walls of the carton are oftriple thickness and the remaining opposed walls are of single thickness thus providin maximum stacking strength. with a minimum of carton stock.

A closing flap 36 is foldably connected to one end of the panel 23'along a fold line 31. Coopcrating closing flaps 39, as, and M, respectively, are connected to the panels it, Hi; and I 2 along a common fold line 62'. All of the flaps 36, 39, 49 and M are of substantially. the area of the endof the carton although two of these flaps 4E! and 4-! 5 panels |6, I4, and 2 along a fold line 41 substantially aligned with the fold line 43.

With the carton in the position illustrated in Figure 4 of the drawings one end of the carton is sealed to provide a closed carton end. To accomplish this result adhesive is applied to one of the flaps such as to the flap 49. The flap 42 is then folded to overlie the end of the carton and the flap 49 is folded over the flap 42 and adhered thereto. Adhesive is next applied to one of the remaining carton flaps such as the flap 45. The flap 46 is then folded over the previously folded flaps 42 and 44 and the flap 45 is folded thereover and adhered thereto. As a result two pairs of flaps are provided at the lower end of the carton and the flaps of each pair are individually connected together by the two pairs of flaps remaining unadhered.

After the carton has been filled a similar sealing process may be used to seal the upper end of the carton. The flaps 36 and 39 are first folded into superimposed relation and adhered together and the flaps 49 and 4| are next folded into super imposed relation over the flaps 36 and 39 and the flaps 49 and 4| are adhered together.

When sealed the carton appears as illustrated in Figure 6 of the drawings. Panel l4 usually forms the top panel and panel 23 usually forms the bottom panel. The side walls which are of triple thickness and the end walls which are of four thicknesses of paper stock form a rigid support so that the carton possesses high stacking strength. When it is desired to open the carton an instrument such as a knife blade B is inserted between the folded edge connecting panels I and I2 and the fold line 24 connecting panel 25 to the bottom panel 23. The knife blade severs the relatively narrow line of adhesive 39, permitting the top panel together with the adhered panels l0 and I2 to fold upwardly from the remainder of the carton along the fold line l as indicated in Figure 7 of the drawings. The top panel is connected to the front panel I 2 by means of flaps 40 and 4| at one end of the carton and by means of flaps 45 and 46 at the other end of the carton, thus holding the top and front side wall of the carton in right angular relationship as illustrated. As soon as the top of the carton is folded upwardly as described the inner front reinforcing panel 25 is free to fold downwardly along the fold line 24 so as to expose two sides of the contents of the carton. The bottom panel 23 and the triple thickness side wall comprising panels I6, I 9 and 2| are held in right angular relation by the flaps 36 and 39 at one end of the carton and by the flaps 42 and 44 at the other end of the carton.

If desired a part of the contents of the carton may be removed and the remainder replaced to rest upon the bottom panel 23. The panel 25 may then be folded up into vertical position and the top closure structure including panels |4, l9 and I2 may then be hinged down into the position shown in Figure 6 of the drawings to enclose the carton contents.

In accordance with the patent statutes, I have described the principles of construction and operation of my carton, and while I have endeavored to set forth the best embodiment thereof, I desire to have it understood that obvious changes may be made within the scope of the following claims without departing from the spirit of my invention.

I claim: 1

1. A carton comprising two foldably connected sections. one section including a bottom panel and a rear wall panel, and the other section including a top panel and a front wall panel, end flaps at each end of said panels, the end flaps at each end of the bottom wall panel being arranged in overlapping surface contact with the corresponding end flaps of the rear wall panel, the end flaps of said top panel being arranged in overlapping surface contact with the corresponding end flaps of the front wall panel, means securing the overlapping end flaps of each section together to hold the bottom panel and rear wall panel in substantially right angular relationship and to hold said top panel and said front wall panel in substantially right angular relationship, and a free panel hingedly connected to the forward edge of said bottom panel and foldable from vertioal position to horizontal position in substantially the plane of the bottom panel, a fold line connecting the upper edge of said rear wall panel and the rear edge of said top panel to hingedly connect said sections, the two sections being foldable from a closed position in which the overlapping end fiaps of the bottom panel and rear wall panel lie inwardly of the end flaps connecting the top panel and the front wall panel, and said free panel lies inwardly of the front wall panel to an open position in which the end flaps of one section do not overlap the end flaps of the other section and in which the free panel is folded substantially into the plane of the bottom panel.

2. The structure described in claim 1 and including an adhesive connection between said front Wall panel and said free panel in closed position of the section.

REYNOLDS GUYER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 132,368 Palmer Oct. 22, 1872 1,103,177 Dye July 14, 1914 1,597,673 Doble Aug. 31, 1926 1,667,975 Labombarde' May 1, 1928 1,920,193 Gary Aug. 1, 1933 1,994,541 spiking Mar. 19, 1935 2,259,822 Kienlen Oct. 21, 1941 2,342,198 Hultin Feb. 22, 1944 

